Low-power consumption power-down detection circuit and motor

Abstract

The utility model discloses a low -power consumption power -down detection circuit and motor, including main control module, voltage comparison module and hand control detection module, voltage comparison module has input and output, and voltage comparison module's output connects main control module, hand control detection module has first connection end L1, second connection end N2, signal input IDET_EN and signal output UP_IN, and hand control detection module's signal input IDET_EN and hand control detection module's signal output UP_IN are electrically connected with main control module, when motor is in working condition, main control module exports high level enable signal to hand control detection module's signal input IDET_EN, and hand control detection module receives enable signal, and hand control detection module opens, when motor is in standby state, main control module exports low level enable signal to hand control detection module's signal input IDET_EN, and after hand control detection module's signal input IDET_EN receives low level enable signal, hand control detection module closes, and voltage comparison module carries out power -down detection to motor.

Description

Technical Field

[0001] This utility model relates to the field of motor power failure detection technology, specifically to a low-power power failure detection circuit and a motor. Background Technology

[0002] In electronic devices, power failure detection circuits play a crucial role. When an external power supply fails, the power failure detection circuit needs to react quickly so that the system can take appropriate measures in a timely manner, such as saving important data or safely shutting down the device.

[0003] Existing power failure detection circuits typically use a single current detection method to detect motor power failure, regardless of whether the motor is in operating or standby mode. They detect whether the motor has lost power by detecting whether current is flowing into it. Because the current detection module usually contains multiple resistors, its energy consumption is high. This fails to meet increasingly stringent energy efficiency standards, resulting in energy waste and increased operating costs. Utility Model Content

[0004] To address the shortcomings of existing technologies, a low-power power failure detection circuit and motor are provided.

[0005] To achieve the above objectives, this utility model provides a low-power power-down detection circuit, including a main control module, a voltage comparison module, and a manual detection module. The voltage comparison module has an input terminal and an output terminal, with the output terminal connected to the main control module. The manual detection module has a first connection terminal L1, a second connection terminal N2, a signal input terminal IDET_EN, and a signal output terminal UP_IN. The signal input terminal IDET_EN and the signal output terminal UP_IN of the manual detection module are electrically connected to the main control module. When the motor is in operation, the main control module outputs a high-level enable signal to the signal input terminal IDET_EN of the manual detection module. Upon receiving the enable signal, the manual detection module is turned on. When the motor is in standby mode, the main control module outputs a low-level enable signal to the signal input terminal IDET_EN of the manual detection module. Upon receiving the low-level enable signal, the manual detection module is turned off, and the voltage comparison module performs power-down detection on the motor.

[0006] According to one embodiment of this utility model, the manual control detection module includes a solid-state relay U4, a MOSFET Q1, and an optocoupler U3. The A terminal of the optocoupler U3 is connected to the first connection terminal L1 of the manual control detection module; the K terminal of the optocoupler U3 is connected to the fourth pin of the solid-state relay U4; the C terminal of the optocoupler U3 is connected to the main control module; and the E terminal of the optocoupler U3 is grounded. The third pin of the solid-state relay U4 is connected to the second connection terminal N2 of the manual control detection module; the first pin of the solid-state relay U4 is connected to the first power supply voltage; and the second pin of the solid-state relay U4 is connected to the drain of the MOSFET Q1. The gate of the MOSFET Q1 is connected to the main control module; and the source of the MOSFET Q1 is grounded. When the motor is in operation, the main control module outputs a high-level enable signal. After receiving the high-level enable signal from the main control module, the MOSFET Q1 conducts, the solid-state relay U4 conducts, and the optocoupler U3 conducts and operates. When the motor is in standby mode, the main control module outputs a low-level enable signal, and the MOSFET Q1 cuts off after receiving the low-level enable signal.

[0007] According to one embodiment of the present invention, the manual detection module further includes a first current limiting unit and a second current limiting unit. One end of the first current limiting unit serves as the first connection terminal L1 of the manual detection module, and the other end is connected to the A terminal of the optocoupler U3. One end of the second current limiting unit serves as the second connection terminal N2 of the manual detection module, and the other end is connected to the third pin of the solid-state relay U4.

[0008] According to one embodiment of the present invention, the manual detection module further includes an anti-reverse element, one end of which serves as the first connection terminal L1 of the manual detection module, and the other end of which is connected to the A terminal of the optocoupler U3.

[0009] According to one embodiment of the present invention, the manual detection module further includes a voltage regulator element, one end of which serves as the second connection terminal N2 of the manual detection module, and the other end of which is connected to the third pin of the solid-state relay U4.

[0010] According to one embodiment of the present invention, the manual detection module further includes a filtering unit. One end of the filtering unit is connected to the A end of the optocoupler U3, and the other end is connected to the K end of the optocoupler U3 and the fourth pin of the solid-state relay U4.

[0011] According to one embodiment of the present invention, the voltage comparison module includes a voltage comparator U7, a third current limiting unit, a fourth current limiting unit, and a diode D9. One end of the third current limiting unit serves as the input terminal of the voltage comparison module, and the other end is connected to the input terminal of the voltage comparator U7. One end of the fourth current limiting unit is connected to the output terminals of the main control module and the voltage comparator U7, respectively, and the other end is connected to the positive terminal of the diode D9 and the second power supply voltage, respectively. The negative terminal of the diode D9 is connected to the input terminals of the third current limiting unit and the voltage comparator U7, respectively.

[0012] According to one embodiment of the present invention, the main control module includes a control chip U12, which has an IDET_EN terminal, an UP_IN terminal, and a POWER_DN ​​terminal. The signal input terminal IDET_EN of the manual control detection module is connected to the IDET_EN terminal of the control chip U12, and the signal output terminal UP_IN of the manual control detection module is connected to the UP_IN terminal of the control chip U12. The output terminal of the voltage comparison module is connected to the POWER_DN ​​terminal of the control chip U12.

[0013] This utility model also provides a motor, including the low-power component failure detection circuit described above, and further including a power input module. The power input module includes an AC-to-DC unit, an anti-reverse unit, a first filter unit, a second filter unit, a third filter unit, a voltage regulator unit, and a fourth filter unit. The AC-to-DC unit has a first input terminal, a second input terminal, a first output terminal, and a second output terminal. The input terminal of the anti-reverse unit is connected to the first output terminal of the AC-to-DC unit. The input terminal of the first filter unit is connected to the output terminal of the anti-reverse unit. The output terminal of the first filter unit is connected to the input terminal of the second filter unit. The output terminal of the second filter unit is connected to the input terminal of the third filter unit. The output terminal of the third filter unit is connected to the input terminal of the voltage regulator unit. The output terminal of the voltage regulator unit is connected to the input terminal of the fourth filter unit.

[0014] The beneficial effects of this invention are as follows: The manual detection module is used to send a signal from the main control module to the manual detection module when the motor is running, causing the manual detection module to operate. The manual detection module then detects whether the motor has lost power while it is running. The voltage comparison module is used to determine whether the motor has lost power by detecting the input voltage when the motor is in standby mode. In the motor's standby mode, the manual detection module is turned off, avoiding the need to use current detection in standby mode to detect power loss, effectively reducing energy consumption. By using different detection modules for different motor operating states to detect power loss, energy waste is avoided, and the operating cost of the motor system is reduced. Attached Figure Description

[0015] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a logic block diagram of the low-power power-down detection circuit in the embodiment; Figure 2 This is a circuit diagram of the main control module in the embodiment; Figure 3 This is a circuit diagram of the hand-controlled detection module in the embodiment; Figure 4 This is a circuit diagram of the voltage comparison module in the embodiment; Figure 5 This is a circuit diagram of the power input module in the embodiment.

[0016] Explanation of reference numerals in the attached figures 1. Main control module; 2. Voltage comparison module; 21. Third current limiting unit; 22. Fourth current limiting unit; 3. Manual control detection module; 31. First current limiting unit; 32. Second current limiting unit; 33. Anti-reverse component; 34. Voltage regulating component; 35. Filtering unit; 4. Power input module; 41. AC to DC unit; 42. Anti-reverse unit; 43. First filtering unit; 44. Second filtering unit; 45. Third filtering unit; 46. Voltage regulating unit; 47. Fourth filtering unit. Detailed Implementation

[0017] The following drawings will disclose several embodiments of this utility model. For clarity, many practical details will be described in the following description. However, it should be understood that these practical details should not be used to limit this utility model. That is, in some embodiments of this utility model, these practical details are not essential. In addition, for the sake of simplicity, some conventional structures and components will be shown in the drawings in a simple schematic manner.

[0018] Furthermore, in this utility model, the use of terms such as "first" and "second" is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit the utility model. They are merely used to distinguish components or operations described with the same technical terms and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If a combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0019] Please refer to Figure 1 , Figure 1 This is a logic block diagram of a low-power power-down detection circuit. This embodiment provides a low-power power-down detection circuit applied to power-down detection of motors.

[0020] In this embodiment, the power-down detection circuit includes a main control module 1, a voltage comparison module 2, and a manual detection module 3. The voltage comparison module 2 has an input terminal and an output terminal, wherein the output terminal of the voltage comparison module 2 is connected to the main control module 1. The manual detection module 3 includes a first connection terminal L1, a second connection terminal N2, a signal input terminal IDET_EN, and a signal input terminal UP_IN. The signal input terminals IDET_EN and UP_IN of the manual detection module 3 are electrically connected to the main control module 1, respectively.

[0021] When the motor is in operation, the main control module 1 outputs a high-level enable signal to the IDET_EN input terminal of the manual control detection module 3. Upon receiving the high-level enable signal, the IDET_EN input terminal of the manual control detection module 3 is activated, and it performs power-down detection on the motor. When the motor is in standby mode, the main control module 1 outputs a low-level enable signal to the IDET_EN input terminal of the manual control detection module 3. Upon receiving the low-level enable signal, the IDET_EN input terminal of the manual control detection module 3 is deactivated, and the voltage comparator module 2 performs power-down detection on the motor.

[0022] Voltage comparison module 2 is used to determine whether the motor has lost power by detecting the input voltage in the motor's standby state. Manual detection module 3 is used to activate the motor when it is running, by sending a signal from the main control module 1. Manual detection module 3 then detects whether the motor has lost power while it is running. By using different detection modules for different motor operating states to detect power loss, the high-current detection method of manual detection module 3 is avoided in the motor's standby state, effectively reducing energy consumption.

[0023] Please refer to Figure 2 , Figure 2 This is the circuit diagram of the main control module. Main control module 1 includes a control chip U12, which has UP_IN, IDET_EN, and POWER_DN ​​terminals. The signal input terminal IDET_EN of the manual control detection module 3 is connected to the IDET_EN terminal of control chip U12, and the signal output terminal UP_IN of the manual control detection module 3 is connected to the UP_IN terminal of control chip U12. The output terminal of voltage comparison module 2 is connected to the POWER_DN ​​terminal of control chip U12.

[0024] Please refer to Figure 3 , Figure 3 This is the circuit diagram of the manual control detection module. Further, the manual control detection module 3 includes a solid-state relay U4, a MOSFET Q1, and an optocoupler U3. The optocoupler U3 has terminals A, K, C, and E, and the solid-state relay U4 has a first pin, a second pin, a third pin, and a fourth pin. During connection, terminal A of the optocoupler U3 is the first connection terminal L1 of the manual control detection module 3, and terminal K of the optocoupler U3 is connected to the fourth pin of the solid-state relay U4. Terminal C of the optocoupler U3 is connected to the main control module 1, and terminal E of the optocoupler U3 is grounded. The third pin of the solid-state relay U4 is connected to the second connection terminal N2 of the manual control detection module 3, the first pin of the solid-state relay U4 is connected to a first voltage source, and the second pin of the solid-state relay U4 is connected to the drain of the MOSFET Q1. The gate of the MOSFET Q1 is connected to the main control module 1, and the source of the MOSFET Q1 is grounded.

[0025] In practical applications, when the motor is running, the main control module 1 sends a high-level signal to the IDET_EN input terminal of the manual control detection module 3. At this time, the gate of MOSFET Q1 receives the high-level signal, and the gate of MOSFET Q1 is high, thus turning on MOSFET Q1. Simultaneously, the solid-state relay U4 turns on, forming a closed loop between the first input terminal of the manual control detection module 3, the optocoupler U3, the solid-state relay U4, and the second connection terminal N2 of the manual control detection module 3. The light emitter inside the optocoupler U3 is energized and emits light, while the light receiver inside the optocoupler U3 receives light. Since the input of the optocoupler U3 is AC, it is triggered during the positive half-cycle of the AC current and turned off during the negative half-cycle. Therefore, the C terminal of the optocoupler U3 outputs a square wave signal. The main control module 1 receives the square wave signal output by the optocoupler U3 and determines that the motor is in a normal state.

[0026] When the motor loses power, the A terminal of optocoupler U3 is de-energized, and optocoupler U3 cannot conduct. A pull-up resistor R10 is connected to the C terminal of optocoupler U3, causing the C terminal of optocoupler U3 to output a high level. The main control module 1 receives the high level output from optocoupler U3 and determines that the motor is in a power-down state. At this time, the main control module 1 outputs corresponding control signals, causing the motor system to take appropriate backup measures.

[0027] When the motor is in standby mode, the main control module 1 sends a low level to the signal input terminal IDET_EN of the manual control detection module 3. The gate of MOSFET Q1 is at a low level, and MOSFET Q1 and solid-state relay U4 cannot be turned on, so the manual control detection module 3 is in the off state.

[0028] Please refer to Figure 3Furthermore, the manual detection module 3 also includes a first current limiting unit 31 and a second current limiting unit 32. One end of the first current limiting unit 31 serves as the first connection terminal L1 of the manual detection module 3, and the other end is connected to terminal A of the optocoupler U3. One end of the second current limiting unit 32 serves as the second connection terminal N2 of the manual detection module 3, and the other end is connected to the third pin of the solid-state relay U4. The first current limiting unit 31 is used to protect the optocoupler U3, preventing it from being directly connected to the input voltage. The second current limiting unit 32 is used to protect the solid-state relay U4, preventing it from being directly connected to the input voltage.

[0029] In this embodiment, the first current limiting unit 31 includes a resistor R11, and the second current limiting unit 32 includes resistors R40 and R41. One end of resistor R11 serves as the first connection terminal L1 of the manual detection module 3, and its other end is connected to terminal A of the optocoupler U3. One end of resistor R40 serves as the second connection terminal N2 of the manual detection module 3, and its other end is connected in series with resistor R41. The other end of resistor R41 is connected to the third pin of the solid-state relay U4.

[0030] Please refer to Figure 3 The manual detection module 3 also includes an anti-reverse element 33. One end of the anti-reverse element 33 serves as the first connection terminal L1 of the manual detection module 3, and the other end is connected to terminal A of the optocoupler U4. In this example, the anti-reverse element 33 includes a diode D6. The positive terminal of the diode D6 serves as the first connection terminal L1 of the manual detection module 3, and the negative terminal of the diode D6 is connected to terminal A of the optocoupler U4. The anti-reverse element 33 is used for reverse current prevention. In actual use, the unidirectional conductivity of the diode D6, i.e., forward conduction and reverse cutoff, prevents current from flowing in the reverse direction in the circuit, thereby preventing reverse current from damaging the components in the circuit.

[0031] Please refer to Figure 3 The manual detection module 3 also includes a voltage regulator element 34. One end of the voltage regulator element 34 serves as the second connection terminal N2 of the manual detection module 3, and the other end is connected to the third pin of the solid-state relay U4. In this example, the voltage regulator element 34 includes a Zener diode ZD2. The positive terminal of the Zener diode ZD2 serves as the second connection terminal N2 of the manual detection module 3, and its negative terminal is connected to the third pin of the solid-state relay U4. The Zener diode ZD2 is used for voltage regulation.

[0032] Please refer to Figure 3 The manual detection module 3 also includes a filter unit 35, one end of which is connected to terminal A of the optocoupler U3, and the other end is connected to terminal K of the optocoupler U3. In this example, the filter unit 35 includes a capacitor C7, the two ends of which are connected in parallel to terminals A and K of the optocoupler U3. The capacitor C7 acts as a coupling element, transmitting AC signals while isolating DC components.

[0033] When the motor is in standby mode, the voltage comparison module 2 performs power failure detection on the motor.

[0034] Please refer to Figure 4 , Figure 4 This is a circuit diagram of the voltage comparison module. Specifically, the voltage comparison module 2 includes a voltage comparator U7, a third current limiting unit 21, a fourth current limiting unit 22, and a diode D9. One end of the third current limiting unit 21 serves as the input terminal of the voltage comparison module 2, and its other end is connected to the input terminal of the voltage comparator U7. One end of the fourth current limiting unit 22 is connected to both the output terminal of the voltage comparator U7 and the main control module 1, and its other end is connected to the anode of diode D9 and the second power supply voltage. The cathode of diode D9 is connected to both the third current limiting unit 21 and the input terminal of the voltage comparator U7, and the anode of diode D9 is connected to both the second voltage source and the fourth current limiting unit 22. It should be noted that the second power supply voltage is +3.3V.

[0035] In practical use, voltage comparison module 2 is used to detect power failure of the motor when it is in standby mode. The input voltage, after being current-limited by the third current-limiting unit 21, is input to the input terminal of voltage comparator U7. Voltage comparator U7 compares the input voltage value with a preset reference voltage value. In this example, voltage comparator U7 is a 5V voltage comparator, meaning the preset reference voltage value is 5V. When the input voltage value is greater than 5V, the output terminal of voltage comparator U7 outputs a low-level signal. The main control module 1 receives the low-level signal and determines that the external power supply to the motor is normal. When the input power supply voltage is less than 5V, the output terminal of voltage comparator U7 outputs a high-level signal. The main control module 1 receives the high-level signal from voltage comparator U7 and determines that the external power supply to the motor has failed. The main control module 1 outputs corresponding control signals based on the received voltage change signals, causing the motor system to take appropriate measures. Thus, by detecting the operating voltage provided by the external power supply in the motor's standby mode, voltage comparison module 2 can detect whether the external power supply has failed.

[0036] This utility model also provides a motor, which includes the aforementioned low-power power-loss detection circuit and a power input module 4. Please refer to [reference needed]. Figure 5 , Figure 5 This is the circuit diagram for the power input module. Power input module 4 is used to convert AC input power into low-voltage DC power to power the motor.

[0037] The power input module includes an AC-to-DC unit 41, a reverse polarity protection unit 42, a first filter unit 43, a second filter unit 44, a third filter unit 45, a voltage regulator unit 46, and a fourth filter unit 47. The AC-to-DC unit 41 has a first input terminal, a second input terminal, a first output terminal, and a second output terminal. The first output terminal of the AC-to-DC unit 41 is connected to the input terminal of the reverse polarity protection unit 42, and the output terminal of the reverse polarity protection unit 42 is connected to the input terminal of the first filter unit 43. The output terminal of the first filter unit 43 is connected to the input terminal of the second filter unit 44, and the output terminal of the second filter unit 44 is connected to the input terminal of the third filter unit 45. The output terminal of the third filter unit 45 is connected to the input terminal of the voltage regulator unit 46, and the output terminal of the voltage regulator unit 46 is connected to the fourth filter unit 47.

[0038] In practical applications, the first and second input terminals of the AC-to-DC unit 41 are used to connect the live and neutral wires of the AC power supply, respectively. The first connection terminal L1 of the manual control detection module 3 is connected to the first input terminal of the AC-to-DC unit 41, and the second connection terminal N2 of the manual control detection module 3 is connected to the second input terminal of the AC-to-DC unit 41. This allows the manual control detection module 3 to detect whether there is current input to the power input module. The AC power is rectified by the AC-to-DC unit 41 and converted into DC power output. The AC-to-DC unit 41 outputs a +12V first supply voltage, which passes through the anti-reverse unit 42, the first filter unit 43, the second filter unit 44, and the third filter unit 45 before being input to the voltage regulator unit 46. The anti-reverse unit 42 is used to prevent the current in the circuit from flowing in reverse. The first filter unit 43 is used for filtering, and the second filter unit 44 and the third filter unit 45 are both used for filtering and energy storage. The voltage regulator unit 46 receives the electrical signal output from the third filter unit 45 and regulates the electrical signal to a 3.3V voltage output to provide a second supply voltage for the motor. The electrical signal output by the voltage regulator unit 46 is output after passing through the fourth filter unit 47.

[0039] It should be noted that the AC to DC unit 41 is an existing rectifier module, and its structure does not involve any improvement points of this application. Therefore, the AC to DC unit 41 will not be described in detail here.

[0040] In this embodiment, the anti-reverse unit 42 includes a diode D1, the positive terminal of which is connected to the first output terminal of the power input module, and the negative terminal of which is connected to the first filter unit.

[0041] The first filtering unit includes an inductor L1, one end of which is connected to the negative terminal of a diode D1, and the other end is connected to the second filtering unit 44. The inductor L1 is used for filtering.

[0042] The second filtering unit 44 includes capacitors C5 and C6. One end of capacitor C5 is connected to inductor L1 and the third filtering unit 45, respectively, and the other end is grounded. Capacitor C6 is connected in parallel with capacitor C5. In this embodiment, capacitor C5 is a polarized capacitor, and the capacitance of capacitor C5 is greater than that of capacitor C6. Capacitor C5 is used to filter out low-frequency noise, and capacitor C6 is used to filter out high-frequency noise. Through the cooperation of capacitors C5 and C6, the electrical signal is made purer. At the same time, capacitors C5 and C6 are also used for energy storage. When the voltage output of AC to DC unit 41 drops, capacitors C5 and C6 discharge to provide temporary power and maintain the stability of the circuit.

[0043] The third filter unit 45 includes capacitors C1 and C2. One end of capacitor C1 is connected to the input terminals of the second filter unit 44 and the voltage regulator unit 46, respectively, and the other end is grounded. Capacitor C2 is connected in parallel with capacitor C1.

[0044] The voltage regulator unit 46 includes a voltage regulator U1, which has an input terminal, an output terminal, and a ground terminal. The input terminal of the voltage regulator U1 is connected to the third filter unit 45, its output terminal is connected to the fourth filter unit 47, and its ground terminal is grounded. In the actual application of the circuit, the AC to DC unit outputs +12V DC power. This +12V DC power passes through the third filter unit 45 and is then input to the voltage regulator U1. The voltage regulator U1 converts the +12V DC power into a stable +3.3V voltage, which is then output after passing through the fourth filter unit 47.

[0045] The fourth filter unit 47 includes capacitors C3 and C4. One end of capacitor C3 is connected to the output terminal of voltage regulator U1, and the other end is grounded. Capacitor C4 is connected in parallel with capacitor C3. Capacitor C3 is a large-capacity electrolytic capacitor, while capacitor C4 has a smaller capacitance than capacitor C3. The combination of capacitors C4 and C3 makes the electrical signal cleaner. At the same time, capacitor C4 is used for energy storage; when voltage regulator U1 has no output voltage, it can release electrical energy to maintain the normal operation of control chip U12.

[0046] The above description is merely an embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this utility model should be included within the scope of the claims of this utility model.

Claims

1. A low-power power-down detection circuit, characterized in that, include: The system comprises a main control module (1), a voltage comparison module (2), and a manual control detection module (3); the voltage comparison module (2) has an input terminal and an output terminal, and the output terminal of the voltage comparison module (2) is connected to the main control module (1); the manual control detection module (3) has a first connection terminal L1, a second connection terminal N2, a signal input terminal IDET_EN, and a signal output terminal UP_IN, and the signal input terminal IDET_EN and the signal output terminal UP_IN of the manual control detection module (3) are electrically connected to the main control module (1) respectively; when the motor is in working condition, the main control module... Block (1) outputs a high-level enable signal to the signal input terminal IDET_EN of the manual control detection module (3). The signal input terminal IDET_EN of the manual control detection module (3) receives the enable signal and the manual control detection module (3) is turned on. When the motor is in standby mode, the main control module (1) outputs a low-level enable signal to the signal input terminal IDET_EN of the manual control detection module (3). After the signal input terminal IDET_EN of the manual control detection module (3) receives the low-level enable signal, the manual control detection module (3) is turned off and the voltage comparison module (2) performs power-off detection on the motor.

2. The low-power power-down detection circuit according to claim 1, characterized in that, The manual detection module (3) includes a solid-state relay U4, a MOSFET Q1, and an optocoupler U3. The A terminal of the optocoupler U3 is connected to the first connection terminal L1 of the manual detection module (3), the K terminal of the optocoupler U3 is connected to the fourth pin of the solid-state relay U4, the C terminal of the optocoupler U3 is connected to the main control module (1), and the E terminal of the optocoupler U3 is grounded. The third pin of the solid-state relay U4 is connected to the second connection terminal N2 of the manual detection module (3), and the first pin of the solid-state relay U4 is connected to the first power supply voltage. The second pin of the solid-state relay U4 is connected to the drain of the MOS transistor Q1; the gate of the MOS transistor Q1 is connected to the main control module; the source of the MOS transistor Q1 is grounded; when the motor is in working state, the main control module (1) outputs a high-level enable signal, the MOS transistor Q1 is turned on after receiving the high-level enable signal output by the main control module (1), the solid-state relay U4 is turned on, and the optocoupler U3 is turned on and works; when the motor is in standby state, the main control module (1) outputs a low-level enable signal, the MOS transistor Q1 is turned off after receiving the low-level enable signal.

3. The low-power power-down detection circuit according to claim 2, characterized in that, The manual detection module (3) further includes a first current limiting unit (31) and a second current limiting unit (32). One end of the first current limiting unit (31) serves as the first connection terminal L1 of the manual detection module (3), and the other end is connected to the A terminal of the optocoupler U3. One end of the second current limiting unit (32) serves as the second connection terminal N2 of the manual detection module (3), and the other end is connected to the third pin of the solid-state relay U4.

4. The low-power power-down detection circuit according to claim 2, characterized in that, The manual detection module (3) also includes an anti-reverse element (33), one end of which serves as the first connection terminal L1 of the manual detection module (3), and the other end of which is connected to the A terminal of the optocoupler U3.

5. The low-power power-down detection circuit according to claim 2, characterized in that, The manual detection module (3) also includes a voltage regulator (34), one end of which serves as the second connection terminal N2 of the manual detection module (3), and the other end is connected to the third pin of the solid-state relay U4.

6. The low-power power-down detection circuit according to claim 2, characterized in that, The manual detection module (3) also includes a filter unit (35), one end of which is connected to the A end of the optocoupler U3, and the other end is connected to the K end of the optocoupler U3 and the fourth pin of the solid-state relay U4.

7. The low-power power-down detection circuit according to claim 1, characterized in that, The voltage comparison module (2) includes a voltage comparator U7, a third current limiting unit (21), a fourth current limiting unit (22), and a diode D9. One end of the third current limiting unit (21) serves as the input terminal of the voltage comparison module (2), and the other end is connected to the input terminal of the voltage comparator U7. One end of the fourth current limiting unit (22) is connected to the output terminals of the main control module (1) and the voltage comparator U7, respectively, and the other end is connected to the positive terminal of the diode D9 and the second power supply voltage, respectively. The negative terminal of the diode D9 is connected to the input terminals of the third current limiting unit (21) and the voltage comparator U7, respectively.

8. The low-power power-down detection circuit according to claim 1, characterized in that, The main control module (1) includes a control chip U12, which has an IDET_EN terminal, an UP_IN terminal and a POWER_DN ​​terminal. The signal input terminal IDET_EN of the manual control detection module (3) is connected to the IDET_EN terminal of the control chip U12, and the signal output terminal UP_IN of the manual control detection module (3) is connected to the UP_IN terminal of the control chip U12. The output terminal of the voltage comparison module (2) is connected to the POWER_DN ​​terminal of the control chip U12.

9. An electric motor, characterized in that, The low-power power-down detection circuit according to any one of claims 1-8 further includes a power input module (4), the power input module (4) including an AC to DC unit (41), an anti-reverse unit (42), a first filter unit (43), a second filter unit (44), a third filter unit (45), a voltage regulator unit (46), and a fourth filter unit (47); the AC to DC unit (41) has a first input terminal, a second input terminal, a first output terminal, and a second output terminal; the input terminal of the anti-reverse unit (42) is connected to the first output terminal of the AC to DC unit (41); the input terminal of the first filter unit (43) is connected to the output terminal of the anti-reverse unit (42); the output terminal of the first filter unit (43) is connected to the input terminal of the second filter unit (44); the output terminal of the second filter unit (44) is connected to the input terminal of the third filter unit (45); the output terminal of the third filter unit (45) is connected to the input terminal of the voltage regulator unit (46); and the output terminal of the voltage regulator unit (46) is connected to the input terminal of the fourth filter unit (47).

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